@INPROCEEDINGS{er2003,
  AUTHOR =       "Rizzi, S., and Bertino, E., and Catania, B., and Golfarelli, M., and Halkidi, M., and Terrovitis, M., and Vassiliadis, P., and Vazirgiannis, M., and Vrachnos, E.",
  TITLE =        "Towards a logical model for patterns",
  BOOKTITLE =    "Proceedings of ER'2003",
  YEAR =         "2003",
}